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Productions de biomasse et conditions de milieu dans des élevages de daphnies alimentées avec des microalgues
Combres, C.; Sevrin-Reyssac, J.; Djonga, L. (1993). Productions de biomasse et conditions de milieu dans des élevages de daphnies alimentées avec des microalgues, in: Barnabé, G. et al. (Ed.) Production, environment and quality: Proceedings of the International Conference Bordeaux Aquaculture '92, Bordeaux, France, March 25-27, 1992. EAS Special Publication, 18: pp. 63-70
In: Barnabé, G.; Kestemont, P. (Ed.) (1993). Production, environment and quality: Proceedings of the International Conference Bordeaux Aquaculture '92, Bordeaux, France, March 25-27, 1992. Special Publication European Aquaculture Society, 18. European Aquaculture Society: Gent. 587 pp., meer
In: Special Publication European Aquaculture Society. European Aquaculture Society: Bredene. ISSN 0774-0689, meer
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  • Combres, C.
  • Sevrin-Reyssac, J.
  • Djonga, L.
Abstract
    Daphnia can be easily fed with microalgae grown on pig manure. They are easily managed and important productions were achieved: 100-400 g.m-3.week-1 from June to September 1991 and 30-80g.m-3.week-1 from October to December. In order to maintain during winter a biomass of Daphnia large enough to eliminate the provided algae, it is necessary to decrease the harvest frequency. During spring and summer, algae were rapidly consumed. As a result, the water becomes transparent and favors the growth of macrophytic algae which interfere with the organisms harvest. Several methods were used to limit their proliferation. A single 2 mg.l-1 application of simazine destroyed almost all the macrophytic algae within 5 days, without any negative effect on the Daphnia. The grass carp consumed the macrophytes efficiently but only in temperatures above 15-17°C and it has been established that these fish feed on Daphnia when there is no vegetation. Optimum density of common carp required to eliminate all the Daphnia produced has been established. In summer conditions, a 30g fish biomass eliminated all the Daphnia produced in 1 m3 of rearing. Daphnia have to be rapidly consumed to avoid a dramatic decrease of microalgae which can provoke desoxygenation.
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